This is a bugfix release for 6.3.x. Refer to the release notes
for version 6.3 for a more complete summary of new features.

Summary:

Repairs automatic configuration support for some
platforms, including Linux, from breakage inadvertently
introduced in version 6.3.1.

Correctly handles function calls on the left side of
BETWEEN and LIKE clauses.

A dump/restore is NOT required for those running 6.3 or 6.3.1.
A 'make distclean', 'make', and 'make install' is all that is
required. This last step should be performed while the postmaster
is not running. You should re-link any custom applications that
use Postgres libraries.

For upgrades from pre-6.3 installations, refer to the
installation and migration instructions for version 6.3.